I think these are more properly called "Dragsters" in Oz; choppers would have elongated forks like the motorcycles.

Must be getting old, I remember when these first came out I was about 12 (19..70) and a boy at my school got a brand new one with a big gear shift lever on the frame top tube which any not have been such a good place for a boy's bike. Being a good little chicster even then I eschewed the silly thing and went and bought a proper bike with mudguards and back-pedal and rack and 28" wheels for my first (rainbow coloured frame, oh my god...). Covered millions of MILES (they were real, no whimpy kilometres). Cry. Wish I still had it!